Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
January 12, 2010
Patent Application Number
10273657
Date Filed
October 18, 2002
Patent Citations Received
Patent Primary Examiner
Patent abstract
Stateful failover redundancy support is provided for network address translation (NAT). A master NAT device is backed-up with at least one back-up NAT device. Existing sessions are synchronized between the two NAT devices, such as via a dedicated link between them. In the event of a failover where the master NAT device is unable to perform its NAT functions, ownership of Internet protocol (IP) addresses is transferred from the master NAT device to the back-up NAT device. The back-up NAT device, which is now owner of the IP addresses, assumes the NAT functionality associated with these IP addresses and continues the existing sessions, as well as processing new sessions.
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